Resumen (otros idiomas)

In this paper we treat some concepts related to the term "extinction". Due to the limited extension of this paper, we can't present an exhaustive study on the subject, a study
which would lead to a full book, because of the different circumstances that have played a role in the popularisation
of "extinction" concept, together with the large number of authors involved in such a popularisation. The concepts we have treated here are of a great importance in Science Teaching, a field in which they are being used with such an ambiguity that they are obscuring, more than shedding any light, the understanding of the world around.